RESOLVED - January 02, 2015Map - Timeline ACCIDENT 3 vehicles 11:14amSite cleared. - M1 Pacific Motorway (F3) Mount Colah at Ku-Ring-Gai Chase Road. Northbound traffic affected. Motorists can use the Pacific Highway as an alternative route from Wahroonga and rejoin the M1 at Berowra.Northbound traffic on the M1 is queued back to the start of the motorway at Wahroonga. . Avoid the area. Use alternative route. Current Queue: 6.5KMs. Last checked at 12:01pm. Heavy traffic conditions.